Grease-gun



APPLIdATIOH FILED JULY 22, 1910.

W. E. SHERBONDY.

GREASE GUN.

Patented Jan. 2, 1912.

Ill

rllllll 1 11112 UNI E STATES PATENT VOFFICE. j

WILLIAM E. sHERBoNnY, or CLEVELAND, e310.

GREASE-GUN. 1,

- Specification of Letters Patent. j

rammed Jan. 2,1912

Application filed July 22,1910. Serial No. 573,244. j

To all whom it may concern: v

.Beit known that I, WILLIAM E. SHER- BONDY, a citizen of the United States, and resident of Cleveland, in the countyof Guyahoga-and State of Ohio, have inventedcertain new and useful Improvements in designed to be an improvement in the 'art and to have increased efficiency and pract1cab1l1ty over devices now in use.

' The device comprises a cylinder, a piston therein and manually operated means for moving the piston to discharge the lubricant, and an automatically acting means for preventing the rebound or return of the piston caused by the internal pressure of the air or grease compressed therein until it is de-- sired to release the instrument.

The invention comprises pawl and rack operating devices and a locking device in connection with a rigid handle, and a finger operated lever for actuating the operating the accompanying drawingsand specifically pawl, and also has reference to means for releasing the pawls and returning the lever, and further comprises the combination and arrangement of parts and construction of details as hereinafter described, shown in pointed out in the claims.

In the accompanying drawings Figure 1 is a longitudinal central section of the device showing an operating and retaining pawl in engagement with a rack upon the piston rod; Fig. 2 is a similar view showing both of the pawls released from the teeth of the rack and locked in their positions.

In these views 1 is the cylinder, 2&5 a reduced noz-zle therefor, 3- is the piston, 4: is the piston rod or stem which passes through an outer head 5 which forms a bearing for the outer end of the rod. To this head is rigidly secured or integral therewith the handle 6 which is formed of such shape as to be readily grasped by the hand and is preferably hollow to contain the operating parts.'- ,8 is a lever :pivoted at 9 on the handle-andth'e lower end thereof is normally thrown out by a spring 10. This lever is of s'uch a shape as to be readily pulled back intothe handle by the fingers of the hand" which grasps the handle. ,At

e upperend of this lever is the projection l lto which is pivoted at 12 a pawl 13 which is adapted when raised to engage the teeth of a rack 14 on one side of the piston rod, a spring 15 normally throws the pawl into engagement with the rack so that when the lever is drawn inwardly the piston'and rod will be pushed forward a short distance into the cylinder to project the grease therefrom. As soon as released the lever will be again thrown out and the pawl 13 will be retracted and will reengage the rack ready for another forward movement. By constant repetition of these movements the lubri'cant can be gradually discharged and can be projectedfin small quantities at a time where regu'ired, the small nozzle-.serving-to permit 0 exact application.

It has' been found that some device for preventing rebound or rearward movement of the piston after discharge is necessary owing to the amount of air which is drawn into the cylinder when it isfilled by. drawing back the piston, and the elasticity of the material'used. This air and grease when compressed by the forward movement of the piston forms a cushion which will force back the piston after every movement of the lever, and hence would tend to'make the device more or less impractical in use. For this reason it is desirable to provide a retaining means adapted to operate automatically as soon as the forward piston movement ceases. To accomplish this action a second or looking pawl 16. is 'emplo ed adapted to engage the rack at the same time with the operating pawl and prevent backward movement of the piston, but not forward movement thereof. A spring 17 maintains this engagement constant. The piston can be operated by hand in the forward direction when the. pawls are engaging.

When it is desired to fill the gun and when ordinary fluid oil lubricant is used, the operating and locking pawls must be released from the rack so that the piston can be operated by hand. To accomplish thls object a flat spring plate or strip S is slldingly attached to the-wall of the handle and the operating pawl is provided wlth a notch N which the upper extremity of the plate S engages when said plate is moved toward the piston rod 4. By means ofthe sliding late the 0 crating pawl can be thrown down out 0 contact with the rack, and in its movement a rearward projection on it will strike against the locking pawl and withdraw that also from contact with the rack. This movement occurs when the lever and pawls are'in the position shown in Fig. 2. A spring detent D which may be an integral part of the plate S will then engage a shoulder R in the wall of the handle and the parts are securely locked. The plate and pawls can be released by means of the push pin P which removes the detent D from the shoulder. R and the sliding plate can then be. removed from contact with the operatin pawl. The lever is simultaneously release with the release of the pawls and flies back to the position shown in Fig. 1. It is ob vious that the operatingand locking pawls can be temporarily thrown out of engagement with the piston rod by merel rotating the piston rod by means of the ob on the end of the rod, and they can be thrown into engagement with the rack by rotating the piston rod back again. When out of engagement with the pawls the piston rod and piston can be'drawn backward manually and quickly.

Having described the invention what .I claim as newand desire to secure by Letters Patent is:

1. In a grease gun, in combination, a cylinder, a piston and rod therein, a rack on the piston rod, a rigid handle for the gun arranged at right angles thereto, a lever pivoted thereon, an operating pawl for said rack pivoted on sald lever, a locking pawl for said rack pivoted on the handle, and a sliding device for releasing said pawls.,

2. In a grease gun, in combination, a cylinder, a piston and piston rod, a rack on the piston rod, a cylinder head and a handle secured at an angle thereto, and a lever pivoted on the handle, an operating pawl pivoted on said lever and engaging said rack, a locking pawl pivoted on the handle, a

sliding releasing device for both said pawls,

said releasing. means serving also to lock said lever, a return spring for said lever, and a return spring for said operating pawl on said lever, and a return spring for said locking ,pawl on said handle.

3. In a grease gun, in combination, a cylinder, a piston and piston rod therefor, a handle, an operating pawl, and a rack for operating the piston in one direction, a pivoted lever to which'the operating pawl is pivoted, a locking awl pivoted to said handle, both said paw s spring actuated to retain them in engagement with said rack, said operating pawl provided with a rearward projection and shoulder thereon, and a strip slidingly mounted in said handle and adapted, to engage said shoulder to remove said operating pawl from contact with the said rack, the said operating pawl being adapted to strike and also release said looking pawl.

4. In a grease gun, in combination, a cylinder, a plston and piston rod. therefor, a cylinder head and a handle secured to said cylinder, said piston rod having a rack on one side, a lever pivoted on said handle, a spring actuated operating pawl pivoted on said lever, and adapted normally to engage said rack, a spring actuated locking pawl pivoted on said handle, means for releasing said operating pawl from said rack, and for locking the same to prevent Contact with said rack, said operatlng pawl adapted to strike against and release said locking pawl, andkto'hold the same but of contact with said rac 5. In a grease gun, in combination, a cyl inder, a piston and piston rod therefor, said piston rod having a rack on one side, a cylinder head and handle for said cylinder, a lever pivoted on said handle, a spring actuated operating pawl pivoted on said lever, a spring operated locking pawl pivoted on said handle, a releasing member movable on said handle and adapted to engage andvrelease said operating pawl and V simultaneously through the instrumentalityof the operating pawl to release the locking pawl, and means for securing the releasing member from movement.

In testimony whereof, I hereunto set my hand this 31st day of June 1910.

WILLIAM E. SHERBONDY. In presence of-- GEO. S. COLE, WM. M. Mormon. 

